Microsoft created the Edge browser by rewriting most of it from scratch (some parts were forked from Internet Explorer). The company's goal was to have a browser that's much more secure and that can keep up with Chrome and Firefox when it comes to supporting the latest web standards. Edge even implemented sandboxing technologies that were similar to what Chrome was using, which put it ahead of Firefox, which is still trying to play catch-up in this regard.

However, despite these improvements in code cleanness and security technologies, it hasn't quite proven itself when faced with experienced hackers at contests such as Pwn2Own. At last year's edition of Pwn2Own, Edge proved to be a little better than Internet Explorer and Safari, but it still ended up getting hacked twice, while Chrome was only partially hacked once. Things seem to have gotten worse, rather than better, for Edge. At this year's Pwn2Own, Microsoft's browser was hacked no less than five times.

(...) Windows 10 didn't do too well either, as every successful browser attack on Windows seemed to have a matching successful attack against the Windows kernel. The conclusion we can draw from the latest Pwn2Own is that Microsoft still has much work to do for the security of both Edge and Windows 10, perhaps coupled with getting better at finding and then fixing bugs more quickly.